Kingspan Thermaroof TR26 Rigid PIR Flat roof board Insulation

Kingspan Insulation Thermaroof TR26 flat roof board

Kingspan Thermaroof TR26

High performance rigid Polyisocyanurate (PIR) flat roof insulation board

Can be used on flat roofs with mechanically fixed single-ply waterproofing membranes.

Fully compatible with most mechanically fixed single–ply waterproofing systems.

Compatible with most green roof systems.

Fibre–free core; manufactured with a blowing agent that has zero ODP and low GWP.

Ideal for new build and refurbishment.

Resistant to the passage of water vapour.

Thicknesses and Availability:

Available in most popular thicknesses from the manufacturer; short lead-times may apply as we may need to get stock in before delivering to site.

This Thermaroof Range includes the following readily available product thicknesses: 25mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 140mm and 150mm.

The folllowing thicknesses are manufactured to order: 40mm, 105mm, 115mm, 125mm, 130mm, 135mm, and 160mm; these may carry minimum order levels.

Due to supply challenges from the manufacturers, please allow extended lead times on all PIR boards. Please feel free to contact me to check availability and lead times.

Product Information

General information about Kingspan Thermaroof TR26

Product Application

Flat roof insulating board

Kingspans high performance polyisocyanurate (PIR) foam board, Thermaroof TR26, is suitable for use in flat roofs waterproofed with mechanically fixed single-ply waterproofing and most green roof applications.

Product Make-up

Core

Kingspan Thermaroof TR26 is manufactured with Nilflam technology, a high performance fibre–free rigid thermoset polyisocyanurate (PIR) insulant manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP)

Facings

Faced on both sides with a low emissivity composite foil, autohesively bonded to the insulation core during manufacture

Product Properties

Thermal Conductivity	0.022 W/m·K
Compressive Strength	150 kPa at 10% compression	BS EN 826: 2013
Nominal Density	32 kg/m³
Board Length	2.4m
Board Width	1.2m
Board Edge	Square
Vapour Resistance	> 100 MNs/gm	BS / I.S. EN 12086: 2013

Product Performance and Guides

Product Performance, Manufacturer Certification, Downloads, and Installation Guides

Thermal Resistance

While we have provided Thermal Resistance values for all thicknesses on the Kingspan TR26 datasheet, some thicknesses may not be readily available.

Items highlighted in green are generally held in stock by Kingspan.

Product	Thickness	Thermal Resistance	kg/m²
Kingspan TR26 25mm	25mm	1.10 m²K/W	1.11 kg/m²
Kingspan TR26 40mm	40mm	1.80 m²K/W	1.50 kg/m²
Kingspan TR26 50mm	50mm	2.25 m²K/W	1.80 kg/m²
Kingspan TR26 60mm	60mm	2.70 m²K/W	2.15 kg/m²
Kingspan TR26 70mm	70mm	3.15 m²K/W	2.50 kg/m²
Kingspan TR26 80mm	80mm	3.60 m²K/W	2.80 kg/m²
Kingspan TR26 90mm	90mm	4.05 m²K/W	3.25 kg/m²
Kingspan TR26 100mm	100mm	4.50 m²K/W	3.50 kg/m²
Kingspan TR26 105mm	105mm	4.75 m²K/W	3.65 kg/m²
Kingspan TR26 110mm	110mm	5.00 m²K/W	3.99 kg/m²
Kingspan TR26 115mm	115mm	5.20 m²K/W	4.01 kg/m²
Kingspan TR26 120mm	120mm	5.45 m²K/W	4.10 kg/m²
Kingspan TR26 125mm	125mm	5.65 m²K/W	4.42 kg/m²
Kingspan TR26 130mm	130mm	5.90 m²K/W	4.60 kg/m²
Kingspan TR26 135mm	135mm	6.10 m²K/W	4.78 kg/m²
Kingspan TR26 140mm	140mm	6.35 m²K/W	4.80 kg/m²
Kingspan TR26 150mm	150mm	6.80 m²K/W	5.10 kg/m²
Kingspan TR26 160mm	160mm	7.25 m²K/W	5.59 kg/m²

Standards & Approval

Kingspan Thermaroof TR26 is manufactured to the highest standards in accordance with requirements BS 4841–4 (Rigid polyisocyanurate (PIR) and polyurethane (PUR) products for building end–use applications. Specification for laminated boards (roofboards) with auto–adhesively or separately bonded facings for use as roofboard thermal insulation under single–ply roofing membranes).

Kingspan Thermaroof TR26 is also manufactured to the highest standards under a management system certified to ISO 9001: 2015 (Quality management systems. Requirements), ISO 14001: 2015 (Environmental Management Systems Requirements), BS / I.S OHSAS 18001: 2007 (Occupational Health and Safety Management Systems Requirements) and ISO 50001: 2018 (Energy Management Systems Requirements with Guidance for Use).

The use of Kingspan Thermaroof TR26 produced at Kingspan Insulation’s Pembridge and Selby manufacturing facilities is covered by BBA Certificate 16/5332.

Product Downloads

Kingspan Insulation Limited

Flat Roof Installation

Over Metal Deck specific

Metal decks should be clean, dry, without large projections, steps or gaps, and should be graded to allow correct falls to all rainwater outlets.

If using a sealed metal deck there is no requirement for a separate vapour control layer.

If the metal deck is not sealed, and the insulation boards are to be bonded down, in order to ensure an adequate bond between the metal deck and the vapour control layer, the metal deck should be suitably primed, in accordance with the primer manufacturer’s instructions, prior to the application of the hot bitumen, or suitable alternative proprietary adhesive system, used to bond the vapour control layer to the deck.

If the metal deck is not sealed, and the insulation boards are to be mechanically fixed, the vapour control layer should be loose–laid.

Over Concrete Deck specific

Concrete decks should be clean, dry, without large projections, steps or gaps, and should be graded to allow correct falls to all rainwater outlets.

The vapour control layer should be loose–laid over the deck.

If the insulation boards are to be mechanically fixed, the vapour control layer should be loose–laid.

Over Ply Deck specific

Timber decks should be clean, dry, without large projections, steps or gaps, and should be graded to allow correct falls to all rainwater outlets.

The vapour control layer should be temporarily stapled or nailed to the deck.

Over Existing Flat Roof specific

The existing waterproofing membrane surface should be clean, dry, without large projections, steps or gaps, and should be graded to allow correct falls to all rainwater outlets.

Where the existing waterproofing membrane is not fit for purpose as a vapour control layer, and the new insulation boards are to be bonded down, a separate vapour control layer should be bonded to it with hot bitumen, or suitable alternative proprietary adhesive system. If the insulation boards are to be mechanically fixed, the vapour control layer should be loose–laid.

General guides for Flat Roof Installation

Where one run of the specified vapour control layer laps another, there should be minimum 150 mm side and end overlaps, which should be adequately sealed.

Turn up the vapour control layer at the edge of the roof to a height appropriate to the specified new waterproofing membrane.

Boards of Kingspan Thermaroof TR26 should be bonded down by laying into hot bitumen (max. temperature 240°C) mopped or poured over the vapour control layer, or with the use of a suitable alternative proprietary adhesive system.

Alternatively, the insulation boards should be secured to the deck using mechanical fixings e.g. telescopic tube fasteners (see ‘Mechanical Fixings’ below).

Insulation boards should always be laid break–bonded, either with their long edges at right angles to the edge of, or diagonally across the roof, and with joints lightly butted. There should be no gaps at abutments.

Roof–light or ventilator kerbs etc. should always insulated with the same thickness of Kingspan Thermaroof TR26 as the general roof area.

A 30 mm thick Kingspan Thermaroof TR26 upstand should be used around the perimeter of the roof on the internal façade of parapets.

A minimum distance of 300 mm should be maintained between the top of the insulation upstand and the bottom of the horizontal roof insulation.

The waterproofing membrane is installed in accordance with the membrane manufacturer’s instructions, over the whole insulated area including any insulation upstands, as soon as possible after laying the insulation boards.

Mechanical Fixings

The number of mechanical fixings required to fix Kingspan Thermaroof TR26 will vary with the geographical location of the building, the local topography, and the height and width of the roof concerned along with the deck type.

A minimum of 4 fixings are required to secure 1.2 x 0.6 m boards of Kingspan Thermaroof TR26 to the deck.

The requirement for additional fixings should be assessed in accordance with BS / I.S. EN 1991−1.4: 2005 + A1: 2010 (National Annex to Eurocode 1. Actions on structures, General Actions, Wind Actions).

Mechanical fixings must be arranged in an even pattern.

Fasteners at insulation board edges must be located > 50 and < 150 mm from edges and corners of the board and not overlap board joints.

Each fixing should incorporate a square or circular plate washer (min. 50 x 50 mm or 50 mm diameter).

If two layers of insulation are to be installed, the base layer should be mechanically fixed with minimum 1 no. fixing in the centre of the insulation board before fixing the top layer as described above.

Price Increases

Supply Challenges